<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>网格布局</title>
		<link rel="stylesheet" type="text/css" href="https://cdn.bootcss.com/twitter-bootstrap/4.3.1/css/bootstrap.min.css"/>
		<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
		<style type="text/css">
			.row div{
				font-size: 50px;
				text-align: center;
				line-height: 100px;
				margin-bottom: 10px;
			}
			.row div a{
				display: block;
				border: 1px solid darkcyan;
			}
		</style>
	</head>
	<body>
	<div class="container">
		<div class="row">
			<div class="col-md-4 col-6">
				<a href="">B</a>
			</div>
			<div class="col-md-4 col-6">
				<a href="">O</a>
			</div>
			<div class="col-md-4">
				<a href="">T</a>
			</div>
		</div>
		<div class="row">
			<div class="col-md-6">
				<a href="">d</a>
			</div>
			<div class="col-md-6">
				<div class="row">
					<div class="col-md"><a href="">a</a></div>
					<div class="col-md"><a href="">a</a></div>
					<div class="col-md"><a href="">a</a></div>
					<div class="col-md"><a href="">a</a></div>
				</div>
			</div>
		</div>
		<div class="row">
			<div class="col-md-1 col-4"><a href="">a</a></div>
			<div class="col-md-1 col-4"><a href="">a</a></div>
			<div class="col-md-1 col-4"><a href="">a</a></div>
			<div class="col-md-1"><a href="">a</a></div>
			<div class="col-md-1"><a href="">a</a></div>
			<div class="col-md-1"><a href="">a</a></div>
			<div class="col-md-1"><a href="">a</a></div>
			<div class="col-md-1"><a href="">a</a></div>
			<div class="col-md-1"><a href="">a</a></div>
			<div class="col-md-1"><a href="">a</a></div>
			<div class="col-md-1"><a href="">a</a></div>
			<div class="col-md-1"><a href="">a</a></div>
		</div>
		<div class="row">
			<div class="col-md-2"><a href="">a</a></div>
			<div class="col-md-2"><a href="">a</a></div>
			<div class="col-md-2"><a href="">a</a></div>
			<div class="col-md-2"><a href="">a</a></div>
			<div class="col-md-2"><a href="">a</a></div>
			<div class="col-md-2"><a href="">a</a></div>
		</div>
		<div class="row">
			<div class="col-md-3"><a href="">a</a></div>
			<div class="col-md-3"><a href="">a</a></div>
			<div class="col-md-3"><a href="">a</a></div>
			<div class="col-md-3"><a href="">a</a></div>
		</div>
		<div class="row">
			<div class="col-md-4"><a href="">a</a></div>
			<div class="col-md-4"><a href="">a</a></div>
			<div class="col-md-4"><a href="">a</a></div>
		</div>
		<div class="row">
			<div class="col-md-5"><a href="">a</a></div>
			<div class="col-md-7"><a href="">a</a></div>
		</div>
		<div class="row">
			<div class="col-md-12"><a href="">a</a></div>
		</div>
	</div>
	</body>
</html>
